1 files changed, 7 insertions, 0 deletions
diff --git a/test/gdbm/test_gdbm.rb b/test/gdbm/test_gdbm.rb
index a4bddfe078..ca0110cd91 100644
--- a/test/gdbm/test_gdbm.rb
+++ b/test/gdbm/test_gdbm.rb
@@ -29,5 +29,12 @@ if defined? GDBM
       }
       assert(v)
     end
+
+    def test_freeze
+      GDBM.open("#{TMPROOT}/a.dbm") {|d|
+        d.freeze
+        assert_raises(TypeError) { d["k"] = "v" }
+      }
+    end
   end
 end